Hello everyone. I've just build the Audio smps 700w (IR2153) posted by Mr. Silvio.
The original File posted by Mr. Silvio is Here.
I've used smd version of the chip instead of DIP version. Also, i've used 4 U1520 diode instead of 3 RURP820C as the output rectifier. In 12V section, I've done it with TIP122+TIP127 and zener combo, while the original uses 7812 and 7912 So I've modified the PCB according to it. Except these, everything including parts value and pcb is exactly same as the original.
My output is +-30V and the overload protection is set to 300W. Everything works fine with some nichrome heating element. But when I attached the SMPS to an amplifier, it creates a 100hz humming noise. Not much loud, but it was there. After doing some test with oscilloscope, I found that there is a visible 100hz noise on the negative rail, while positive rail is ok.
But the main problem started, when I've connected a mobile phone via an audio jack. My phone screen completely gone mad. The touch screen does not work properly, random touches occurs automatically. It seems, there are some high frequency noise presents on the power rail.
How can I solve this problem? What did I missed? Thanks in advance.
Here is my Board-
The original File posted by Mr. Silvio is Here.
I've used smd version of the chip instead of DIP version. Also, i've used 4 U1520 diode instead of 3 RURP820C as the output rectifier. In 12V section, I've done it with TIP122+TIP127 and zener combo, while the original uses 7812 and 7912 So I've modified the PCB according to it. Except these, everything including parts value and pcb is exactly same as the original.
My output is +-30V and the overload protection is set to 300W. Everything works fine with some nichrome heating element. But when I attached the SMPS to an amplifier, it creates a 100hz humming noise. Not much loud, but it was there. After doing some test with oscilloscope, I found that there is a visible 100hz noise on the negative rail, while positive rail is ok.
But the main problem started, when I've connected a mobile phone via an audio jack. My phone screen completely gone mad. The touch screen does not work properly, random touches occurs automatically. It seems, there are some high frequency noise presents on the power rail.
How can I solve this problem? What did I missed? Thanks in advance.
Here is my Board-